H15_ Kinetics 2-problems

# H15_ Kinetics 2-problems - markowitz(am45362 – H15...

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Unformatted text preview: markowitz (am45362) – H15: Kinetics 2 – mccord – (51625) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The reaction 2 NO(g) + 2 H 2 (g) → N 2 (g) + 2 H 2 O(g) is first-order in H 2 and second-order in NO. Starting with equal concentrations of H 2 and NO, the rate after 25% of the H 2 has reacted is what percent of the initial rate? 1. 42.2% 2. 75.0% 3. 56.3% 4. 1.56% 5. 6.25% 002 10.0 points A reaction has k = 8 . 39 M − 1 · s − 1 . How long does it take for the reactant concentration to drop from 0.0840 M to 0.0220 M? 1. 2.00 s 2. 8.39 s 3. 5.42 s 4. 1.42 s 5. 4.00 s 003 10.0 points The graph is a plot of ln A vs t for the reaction A → B 1 2 3 4 5 0.2 0.4 0.6 0.8 1.0 1.2 rate = k [A] is the rate law for this reaction. What was the initial concentration of [A]? 1. 0.6 M 2. 3.0 M 3. 1.1 M 4. 5 M 5. 1.8 M 004 10.0 points Consider the mechanism ClO − (aq) + H 2 O( ℓ ) → HOCl(aq) + OH − (aq) K , fast I − (aq) + HOCl(aq) → HOI(aq) + Cl − (aq) k 1 , slow HOI(aq) + OH − (aq) → OI − (aq) + H 2 O( ℓ ) k 2 , fast What is the rate law?...
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H15_ Kinetics 2-problems - markowitz(am45362 – H15...

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